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WorksheetsMLR Engine Repair FINAL
Total questions: 50
Worksheet time: 25mins
1. All of the following are in the engine block EXCEPT:
A. Crankshaft
B. Connecting rods
C. Heater core
D. Pistons
2. Technician A says that the camshaft must always be located in the engine block. Technician B says the block is machined with passages for coolant circulation called water jackets. Who is correct?
A. Technician A only
B. Technician B only
C. Both Technician A and B
D. Neither Technician A nor B
3. The round holes machined into the block for the pistons to travel up and down in are called:
A. Combustion chambers
B. Bores
C. Water jackets
D. None of the above
4. What component is forced up into cylinder bores by the crankshaft?
A. Camshaft
B. Crankshaft
C. Intake valve
D. Piston
5. What is the bottom of piston travel called?
A. Top dead center (TDC)
B. Center piston travel
C. Piston reach
D. Bottom dead center (BDC)
6. Which piston ring prevents combustion pressure from entering the crankcase?
A. Compression rings
B. Coolant rings
C. High pressure “O” rings
D. Oil control rings
7. Technician A says that the larger end of the connecting rod is attached to the crankshaft through rod bearing inserts. Technician B says connecting rods connect each rod to the camshaft. Who is correct?
A. Technician A only
B. Technician B only
C. Both Technician A and B
D. Neither Technician A nor B
8. All of the following components are connected to the crankshaft EXCEPT:
A. Counterweights
B. Flywheel
C. Harmonic balancer
D. Water pump
9. What is the function of an Oil Bypass Valve?
A. To open at high speed to reduce oil pressure
B. To allow oil to drain from the cylinder heads back into the crank case
C. To open in the event of a clogged filter
D. To redirect oil through the cooling system and control its temperature
10. Which of these is currently the most common engine type?
A. Slant
B. Inline
C. Rotary
D. Boxer
11. A Pressure Tester (pump) or UV dye can be used to find what?
A. Excessive Crankcase pressure
B. Valve Guide leakage
C. Transmission Fluid leaks
D. Cooling System leaks
12. The cam acts directly on a rocker in which type of engine?
A. Dual Overhead cam engine
B. Single overhead cam engine
C. Pushrod engine
D. None of these
13. What is the most common type of fuel used in passenger vehicles?
A. Gasoline
B. Ethanol
C. Natural gas
D. Propane
14. Which of these is NOT true of Air-Cooled engines?
A. They have cast fins on some engine parts
B. They maintain temperature better than liquid-cooled engines
C. They run hotter
D. They are common in power equipment
15. Antifreeze provides protection against:
A. Boiling
B. Corrosion
C. Freezing
D. All of the above
16. Overheating can be caused by all of the following EXCEPT:
A. Blown head gasket
B. Proper fan operation
C. Inoperative cooling fan
D. Low coolant
17 When a temperature gauge reads hot, what should be done first?
A. Turn the engine off
B. Check the coolant level
C. Replace the engine thermostat
D. All of these
18. Technician A says that when diagnosing an automotive system a logical, step-by-step approach should be developed. Technician B says that even proper service can cause engine mechanical problems and increased wear. Who is correct?
A. Technician A only
B. Technician B only
C. Both Technician A and B
D. Neither Technician A nor B
19. What should always be done before beginning any diagnosis?
A. Test Drive
B. Change the oil and filters
C. Fill out a Diagnostic Worksheet
D. Verify the Customer Concern
20. Technician A says that the camshaft must open and close each valve at exactly the right time relative to piston position. Technician B says overhead cam engines can be belt-driven. Who is correct?
A. Technician A only
B. Technician B only
C. Both Technician A and B
D. Neither Technician A nor B
21. What is the purpose of oil drains in a cylinder head?
A. Aid oil getting back into the crankcase
B. Aid oil getting in the combustion chamber
C. Prevent oil from entering the combustion chamber
D. Prevent oil from entering into the cooling system
22. What are valve springs used to do in a cylinder head?
A. Close valves
B. Open valves
C. Prevent oil from entering the combustion chamber
D. None of the above
23. In a pushrod engine, which engine component moves the pushrod directly?
A. Camshaft
B. Crankshaft
C. Lifter
D. Rocker arm
24. What must a technician first do before beginning diagnostics on any system?
A. Conduct a Road Test
B. Check for Codes
C. Check for TSBs
D. Understand the normal operation of the system
25. Technician A says that valves close against precision-machined areas, or inserts, in the combustion chambers called valve seats. Technician B says some valve seats are located in the block on later model engines. Who is correct?
A. Technician A only
B. Technician B only
C. Both Technician A and B
D. Neither Technician A nor B
26. What is the main job of a cylinder head?
A. Contain the rapid increase in combustion chamber temperature
B. Contain the rapid increase in combustion chamber pressure
C. Prevent engine oil from getting past the pistons
D. Hold the Head Gasket in place
27. All of the following are part of a cylinder head EXCEPT:
A. Combustion chamber
B. Radiator
C. Valve guides
D. Valve seats
28. What can be used as a tracing powder when checking for small oil leaks?
A. Aerosol foot powder
B. Brake cleaner
C. Spray lubricant (WD-40)
D. None of the above
29. What component can mask internal engine oil leaks?
A. Catalytic converter
B. Oil bypass valve
C. Oil diverter valve
D. Oil pressure sending unit
30. Technician A says that a stethoscope can be used to identify engine noise. Technician B says that only older vehicles use synthetic motor oils. Who is correct?
A. Technician A only
B. Technician B only
C. Both Technician A and B
D. Neither Technician A nor B
31. When repairing a broken bolt and after installing an eze-out you discover that the eze-out alone will not remove the broken bolt. What action should be taken?
A. Apply high strength epoxy glue to the mating surface and install the effected component
B. Over-drill the broken bolt and replace with a larger bolt
C. Remove the bolt by cutting it out with a torch
D. Leave both out all together
32. When servicing a hybrid vehicle and removing the high voltage service plug, how long should a technician wait before beginning work?
A. 1 minute
B. 5 minutes
C. 10 minutes
D. No waiting is required
33. What causes engine oil to look milky?
A. Coolant mixing with gasoline
B. Engine oil mixing with air
C. Engine oil mixing with coolant
D. Gasoline mixing with engine oil
34. When the coolant system thermostat is closed, coolant is allowed to flow to the:
A. Water pump
B. Radiator
C. Fuel injector
D. Both A and B
35. The purpose of the heater core is to:
A. Assist the AC compressor in cooling the passenger compartment
B. Assist the radiator in cooling the engine
C. Assist with engine warm-up
D. Provide heat for the passenger compartment
36. What is the job of the heater control valve?
A. Control coolant flow through the cylinder head
B. Control coolant flow through the engine
C. Controls coolant flow through the heater core
D. Control coolant flow through the radiator
37. Technician A says never attempt to remove the radiator cap with a cold engine. Technician B says never attempt to install a radiator cap on a cold engine. Who is correct?
A. Technician A only
B. Technician B only
C. Both Technician A and B
D. Neither Technician A nor B
38. When replacing a cylinder head gasket, the mating surfaces should be cleaned:
A. Using a die grinder and stones
B. Using a gasket scraper
C. Using a surface cleaning disk
D. Using a razor blade
39. Which component attaches a Connecting Rod to a Piston?
A. Wrist Pin
B. Counter Pin
C. Crank Pin
D. Stroke Pin
40. Which of these is NOT a function of the flywheel?
A. Power transfer to the transmission
B. Engage the Starter
C. Smooth out power pulses
D. Balance the crankshaft
41. What is the first step to take during Preliminary Checks?
A. Road Test
B. Check TSBs
C. Visual Inspection
D. Pull Trouble Codes
42. Which of these does NOT describe a type of lifter?
A. Mechanical
B. Roller
C. Hydraulic
D. Fixed
43. A loud noise that comes from the lower part of an engine and increases with engine speed is likely what?
A. Piston Slap
B. Rod Knock
C. Piston Pin Knock
D. Valve Misadjustment
44. Which engine design requires two full rotations of the crankshaft to complete one cycle?
A. Two Stroke
B. Combustion Cycle
C. Four Stroke
D. Rotary
45. Which of these is NOT an advantage of Timing Belts?
A. Less likely to break
B. Do not require lubrication
C. lighter
D. Quieter
46. Technician A says that the Firing Order is always the same as the cylinder numbering. Technician B says that the Firing Order is determined only by whether the engine is an Inline or a 'V'. Who is correct?
A. Technician A only
B. Technician B only
C. Both Technician A and B
D. Neither Technician A nor B
47. One of the symptoms of low oil pressure is:
A. Blue smoke from the tailpipe
B. Hesitation during acceleration
C. A ticking sound
D. The oil dipstick popping out
48. A V6 engine with a cylinder volume of 529 Cubic Centimeters has what approximate displacement?
A. 3100 CC
B. 3.0 L
C. 3300 CC
D. 3.2 L
49. The process of using a magnetic detector to find cracks is called what?
A. Electropressure
B. Magnafluxing
C. Harmonic Resonance
D. Dynamic Fielding
50. Technician A says that one of the three most common oil pressure problems includes high oil pressure. Technician B says that a faulty oil pressure indicator light is rarely a problem when diagnosing oil pressure problems. Who is correct?
A. Technician A only
B. Technician B only
C. Both Technician A and B
D. Neither Technician A nor B
